Crack width calculation

[OAP]

Hi Folks,

Do anyone have an idea how to calculate the crack width in concrete bored pile? This bored pile is 40" Dia. and used as anchor pile during perforrm the static load test Thanks in advance

Cheers,
OAP

 

[boo1]

The stress at the root of a flaw or crack is more intense than the nominal applied stress. This stress intensity is called K, the stress intensity factor. The basic relationship between stress intensity factor, nominal stress and flaw size proposed by Irwan is:
K=Sigma*(Pi*A)**1/2

At some value of stress or at some length of crack, the crack will become unstable and propagate quickly until the component fractures or the remaining cross section is reduced to the point that rupture occurs. That critical stress intensity is called the fracture toughness. It is of special note that fracture toughness is a material property just like Young’s modulus or density. The roman numeral subscript ‘I’ designates mode I fracture which is the crack opening mode. Mode I fracture is the most prevalent mode of fracture.

K(ic)=Sigma(d)*(Pi*Ac)**1/2

 

[rapt]

boo1,

Does this really apply to reinforced concrete members?

OAP
Many Concrete Design text books and design codes give methods for calculating crack widths. They vary widely in methodology and results. There is no simple exact formula. I would suggest you look in these types of references for your location.